1. Scope of Application and Industry Positioning
DIN 3356 (German Standard)
Focus on steel industrial valves (globe valves, check valves, etc.), especially for petroleum, Chemical industry, steam and other fields of medium and high pressure scenarios.
With DIN 3202 (structure length), DIN 2543 (flange interface) and other supporting standards, forming a complete German standard valve system.
API Standards (American Standards)
are centred on the oil and gas industry, e.g. API 600 (steel gate valves), API 6D (pipeline valves), etc., with emphasis on valve performance in high-pressure, low-temperature and safety-critical scenarios.
Often mandatory references to U.S. federal regulations (such as pipeline safety regulation), covering the design, testing the entire process.
JIS standard (Japanese standard)
for general industrial valves (such as JIS B2071 cast iron valves, JIS B2081 cast steel valves), taking into account the chemical industry, construction and other areas of low and medium pressure needs.
More emphasis on the Japanese standard flange (JIS B2220) and threaded interface of the local adaptation.
2. Differences in design requirements
| Terms | DIN 3356 | API standard | JIS standard |
|---|---|---|---|
| Material | Cast steel (GS-C25), stainless steel, etc., emphasizing high temperature and high pressure resistance | ASTM materials (such as A216 WCB) are preferred to adapt to oil and gas corrosive environments | Mainly cast iron (FC200) and cast steel (SCPH2), focusing on economy |
| Sealing | Supports bellows seal and metal hard seal, suitable for harsh media such as steam | Mainly non-metallic elastic seals (such as PTFE), taking into account the need for rapid replacement | Rubber or graphite fillers are often used, which are less expensive. |
|
Connector |
Flanges according to DIN 2543, threads according to DIN standards | Flanges are compatible with ASME B16.5, welding interfaces are in accordance with ASME B16.2 | Flange dimensions follow JIS B2220, threads conform to JIS specifications |
3. Test methods and standards matching
DIN 3356
The test is based on DIN EN 12266, focusing on the sealing verification of cryogenic valves after deep cryogenic treatment.
The DIN 3230 inspection process is required to detect leak rates more strictly.
API standard
It is mandatory to follow the API 598 test specification, with a high proportion of high-pressure liquid tests and a small amount of leakage allowed (metal sealing scenarios).
Some valves need to additionally meet the NACE MR0175 hydrogen sulfide corrosion resistance requirements.
JIS standard
The test refers to JIS B2003, the test pressure is relatively low (such as the shell test is 1.5 times the nominal pressure), and focuses on the verification of conventional working conditions.
4. Industry application scenarios
DIN 3356: European industrial projects (especially German equipment), harsh media (high-temperature steam, corrosive chemicals) scenarios.
API standard: global oil and gas pipelines, offshore platforms, LNG facilities and other high-pressure and high-risk areas.
JIS standard: General industrial systems in Japan and Southeast Asian markets (such as water treatment, low-pressure gas transmission).
Summary of core differences
Professional fields: DIN 3356 focuses on European medium and high-pressure industrial valves, API focuses on oil and gas high-pressure pipelines, and JIS covers general industrial valves.
Technical severity: API > DIN > JIS (gradually relaxed from materials, test pressure to leakage control).
International adaptation: API is the mainstream of global oil and gas projects, DIN is mostly used for European technology exports, and JIS focuses on regional markets.
